[{"data":1,"prerenderedAt":-1},["ShallowReactive",2],{"$faXTjrUEU3IQp8V0CRPFHoTW0g0Igop1WGNRSrViIB7s":3},{"answer":4,"createTime":5,"id":6,"options":7,"origin":12,"question":15,"related":16,"source":26,"type":37},[],"2025-12-13 11:20:20",1074501738,[8,9,10,11],"select sdept ,avg(sage) from student group by sdept having avg(sage) &gt;20","select sdept ,avg(sage) from student where ssex='女' group by sdept","select sdept ,avg(sage) from student where ssex='女' group by sdept having avg(sage) &gt;20","select sdept ,avg(sage) from student where ssex='女' and avg(sage) &gt;20 group by sdept",{"courseImg":13,"courseName":14},"https:\u002F\u002Ftihai-oss-cloud.itihey.com\u002Fimg\u002F757d92badb28516db1ac0d11a5eb7a6e.jpg","数据库原理及开发应用","针对表Student (sno,sname,ssex,sage,sdept),其中sno为学号,sname为姓名,ssex为性别,sage为年龄,sdept为系别.查询女生平均年龄超过20岁的系别以及女生平均年龄.( )",[17,28,38,46,51,60,65,70,79,84],{"answer":18,"createTime":5,"id":19,"options":20,"question":25,"source":26,"type":27},[],1074501416,[21,22,23,24],"my_name","name","123","#123","下列正确的标识符有( )","v2",1,{"answer":29,"createTime":5,"id":30,"options":31,"question":36,"source":26,"type":37},[],1074501421,[32,33,34,35],"关系模型数据库系统","网状模型数据库系统","层次模型数据库系统","面向对象模型数据库系统","主流的模型数据库系统是( )",0,{"answer":39,"createTime":5,"id":40,"options":41,"question":44,"source":26,"type":45},[],1074501527,[42,43],"对","错","SQL语言中,利用字符串函数操作,&quot; SELECT LEFT('2020年02月29日',4)&quot;的结果是字符串&quot;2020&quot;.( )",3,{"answer":47,"createTime":5,"id":48,"options":49,"question":50,"source":26,"type":45},[],1074501545,[42,43],"用户定义完整性是指要求表中的每一行具有唯一的标识.( )",{"answer":52,"createTime":5,"id":53,"options":54,"question":59,"source":26,"type":37},[],1074501549,[55,56,57,58],"SELECT * FROM Book WHERE Author LIKE '%有为%'","SELECT * FROM Library WHERE Author LIKE '有为'","SELECT * FROM Book WHERE Author LIKE '有为'","SELECT * FROM Library WHERE Author = '有为'","要查询Library数据库Book表中作者名中含有&quot;有为&quot;的书籍信息,可用( )命令",{"answer":61,"createTime":5,"id":62,"options":63,"question":64,"source":26,"type":45},[],1074501653,[42,43],"唯一索引中不允许插入重复的列值.( )",{"answer":66,"createTime":5,"id":67,"options":68,"question":69,"source":26,"type":45},[],1074501659,[42,43],"连接是关系型数据库中常用的多表查询数据的模式.( )",{"answer":71,"createTime":5,"id":72,"options":73,"question":78,"source":26,"type":37},[],1074501668,[74,75,76,77],"abc","abcd","abcde","aceg","语句&quot;select substring('abcdefg',1,4)&quot;返回的结果是( )",{"answer":80,"createTime":5,"id":81,"options":82,"question":83,"source":26,"type":45},[],1074501683,[42,43],"使用SQL Server Management Studio 删除数据库后,仍然可以恢复内容.( )",{"answer":85,"createTime":5,"id":6,"options":86,"question":15,"source":26,"type":37},[],[8,9,10,11]]